Yes. eSIMAdvice currently lists 26 ConnectMeGuru Belize plans.
The lowest displayed ConnectMeGuru Belize plan is Belize · 500 MB · 1 day · 4G, at $5.21.
Belize · 20 GB · 20 days · 4G is the current best-value match by displayed price per GB: $4.08/GB ($81.64 in total).
Yes. Eligible displayed prices already include the active ESIMTWEAKS10 coupon where the provider rule applies.